As my post went on, my idea evolved. The class lore chain quest should be gated by lvl and zone. So, a night elf would pick up a class-related quest fly in (where your quest tracker hud is) upon completing the breadcrumb quest relevant to your class. For example Nigh Elves would get them for Darkshore, Ashenvale, Stonetalon, Desolace, Feralas, Felwood, Winterspring, Silithus, Terrokkar (via major bread crumb), Sholazar Basin (via serious breadcrumb), Mount Hyjal. Mount Hyjal should be the terminus for the Night Elf lore/class quest chain, IMO. There would be race sharing for several zones... Draenei/Orcs would be more represented in Outlands than other races. Worgen lore racials would be an interesting discovery of how Arugal's wild worgen (the ones alliance have been killing for xp since before cata) differ from the Gilnean strand. It would be awesome, I think.
Anyway, that would be cool IMO.
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in my idea tie in the relevant lore and have what you're doing demonstrating that tier of talent points.
Say a Night Elf Mage might be doing a phases event where they see the old High elfs, that would likely be the general theme of the Night elf mage quests, with each tier uncovering some part of a story and giving you a good reason to use the given tier of talents.
I'd actually opt for every 10 levels but you need the toon to evolve some as the class before doing more so each tier might be better.
also do it with phasing and portals.
Classes that can heal would have a reason there to heal but if speced as DPS it'd be needed that you DPS. decently.